How to send packet to ONOS

I‘m stufying how to process packet in ONOS.
I notice Reactive Forwarding but when I run fabric.p4 in stratum switch and fabric-tna pipeline , fwd app in ONOS it doesn’t work like Experimental Features - ONOS 1.1 - Wiki
Maybe I lack something?
I guess ONOS can only process packet but how to send packet to ONOS?